That's because the things we like doing on the internet - like streaming movies, TV and music, and playing games - require lots of information to move quickly from the internet to our computer, device or TV. The faster you can download and upload data, the more enjoyable your internet experience will be. When we talk about the speed at which data moves across the internet we refer to megabits per second (1,000,000 bits per second) and more recently gigabits per second (1,000,000,000 bits per second). The basic unit of measurement for a piece of computer data is the bit, which can be either 0 or 1.